AI 中文总结
本研究将预退火生长概念应用于随机沉积的金胶体，抑制催化剂团聚，实现高密度III-V族纳米线生长，为光电子应用提供可扩展的无光刻途径。
AI 中文摘要
III-V族半导体纳米线（NWs）是光电子和光电化学应用的极具前景的平台，器件性能高度依赖于纳米线的密度和空间排列。有序阵列可实现精确控制，但其制备需要复杂且成本高昂的光刻技术；无序生长是一种可扩展的替代方案，但受限于对催化剂分布和颗粒团聚的控制不足。本研究采用商用金（Au）胶体溶液作为催化剂，通过气-液-固生长模式探究无序III-V族纳米线阵列的密度缩放。重复沉积循环可使颗粒密度接近线性增加，但最终受简单随机模型未捕捉到的非线性团聚效应限制。为解决该问题，研究人员将此前已在图案化催化剂阵列中建立的预退火生长概念应用于随机沉积的金胶体，从而抑制热诱导的聚结并稳定催化剂分布。该方法可使纳米线密度提升多达10倍，同时改善均匀性和垂直产率，在直径为100至200 nm的胶体上均得到验证。总体而言，本研究为高密度III-V族纳米线集合提供了一种可扩展、无需光刻的途径，并为理解胶体基生长过程中颗粒动力学的作用提供了见解。
英文摘要
III-V semiconductor nanowires (NWs) are a promising platform for optoelectronic and photoelectrochemical applications, where device performance strongly depends on NW density and spatial arrangement. While ordered arrays provide precise control, their fabrication requires complex and costly lithographic techniques. Unordered growth offers a scalable alternative but is limited by insufficient control over catalyst distribution and particle agglomeration. Here, we investigate the density scaling of unordered III-V NW arrays using commercially available Au colloid solutions as catalysts for NW growth via vapor-liquid-solid growth mode. Repeated deposition cycles yield a near-linear increase in particle density, which is ultimately limited by non-linear agglomeration effects not captured by simple stochastic models. To address this limitation, a previously established pre-anneal growth concept is transferred from patterned catalyst arrays to randomly deposited Au colloids, thereby suppressing thermally induced coalescence and stabilizing the catalyst distribution. This approach enables up to a tenfold increase in NW density while improving uniformity and vertical yield. The method is demonstrated for colloid diameters between 100 and 200 nm. Overall, this work provides a scalable, lithography-free route toward high-density III-V NW ensembles and offers insight into the role of particle dynamics in colloid-based growth processes.
